Novel electrode slurry uniformity testing device and application method thereof

Abstract

The invention relates to a novel electrode slurry uniformity testing device and a use method thereof, and belongs to the technical field of fuel cells, the novel electrode slurry uniformity testing device comprises a slurry container assembly, a temperature compensator, a controller and a thermoelectric force measuring instrument; the slurry container assembly comprises a container body and container contacts, the container contacts are arranged on the two sides of the container body respectively, the two ends of the controller are connected with a change-over switch through a temperature compensator and a thermocouple conductor respectively, and the change-over switch is configured to be connected with the corresponding container contacts when used. Two ends of the thermoelectric force tester are respectively connected with the corresponding temperature compensators through thermocouple conductors; different access temperatures are set at the two ends of the battery electrode slurry respectively, the access temperatures are kept unchanged, the total thermoelectric force value is measured, whether the total thermoelectric force value fluctuates or not or the fluctuation range is observed to determine the uniformity of the battery electrode slurry, and the effects of short test period and low test cost are achieved.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, specifically referring to a novel electrode slurry uniformity testing device and its usage method. Background Technology

[0002] Slurry preparation is the first process in fuel cell production. Electrode slurry is a non-Newtonian fluid formed by dispersing solid particles such as active materials, conductive agents, and binders in a solvent. Its flowability, stability, and uniformity determine the performance, cycle life, and consistency of the fuel cell. Before coating, the properties of the electrode slurry must be tested and characterized to evaluate its suitability.

[0003] Currently, methods for characterizing the uniformity of electrode slurries include: laser particle size analysis, elemental analysis, electrode resistivity analysis, and scanning electron microscopy. By testing downstream products of the slurry, its uniformity can be quantitatively analyzed, but these methods generally have the following shortcomings: (i) long testing cycle, as the downstream products of the slurry are indirectly tested, making it impossible to make an immediate judgment during the slurry preparation process, and the testing process is complex, resulting in a long production cycle; (ii) high testing cost, requiring the use of expensive instruments for multiple sets of tests.

[0004] A thermocouple thermometer uses a thermocouple as the temperature-sensing element to measure the thermoelectric potential corresponding to temperature, which is then displayed on the instrument. According to a corollary of the thermocouple's law of homogeneous conductors (if a material is connected to a thermocouple circuit, as long as the temperatures of its two terminals are the same, the total thermoelectric potential of the circuit is unaffected), if the temperatures of the two terminals of the connected material are kept the same, but the total thermoelectric potential changes, it indicates that the connected material is non-homogeneous. The greater the change in thermoelectric potential, the worse the homogeneity. Summary of the Invention

[0005] In order to overcome some of the problems mentioned in the background above, the present invention provides a novel electrode slurry uniformity testing device and its usage method, so as to at least partially solve the above problems.

[0006] According to the technical solution of the present invention, a novel electrode slurry uniformity testing device is provided, including a slurry container assembly, a temperature compensator, a controller, and a thermoelectric potential measuring instrument;

[0007] The slurry container assembly includes a container body and container contacts. Container contacts are respectively provided on both sides of the container body. The two ends of the controller are respectively connected to a switching switch through a temperature compensator and a thermocouple conductor. The switching switch is configured to connect to the corresponding container contact when in use.

[0008] The thermoelectric potential tester is connected to the corresponding temperature compensator at both ends via thermocouple conductors.

[0009] Preferably, multiple container contacts of different heights are provided on both sides of the container body, and a switching switch can switch between different container contacts located on the same side of the container body.

[0010] Preferably, the container contacts, switching switches, and thermocouple conductors are all homogeneous conductors.

[0011] Preferably, the controller and the temperature compensator are connected by a wire.

[0012] Preferably, the thermoelectric potential tester is equipped with a display and a signal amplifier, and the display shows the thermoelectric potential value amplified by the signal amplifier.

[0013] Preferably, the container contact penetrates the side wall of the container body and contacts the battery slurry placed inside the container body, and the container contact and the container body are sealed together.

[0014] On the other hand, the present invention also provides a method for using a novel electrode slurry uniformity testing device, comprising the following steps:

[0015] The battery electrode slurry is placed inside the container, and the temperature of the temperature compensators located at both ends of the controller is set by the controller.

[0016] Connect the switch to the corresponding container contact and observe the thermoelectric potential value on the thermoelectric potential measuring instrument.

[0017] Furthermore, the switch was connected to different container contacts on one side of the corresponding container body, and the thermoelectric potential values ​​on the thermoelectric potential measuring instrument were observed respectively.

[0018] Furthermore, if the thermoelectric potential value on the thermoelectric potential measuring instrument remains unchanged or fluctuates within the allowable error range, then the uniformity of the measured battery electrode slurry is good.

[0019] If the fluctuation of the thermoelectric potential value on the thermoelectric potential measuring instrument exceeds the allowable error range, then the uniformity of the measured battery electrode slurry is poor.

[0020] On the other hand, the present invention also provides an application of a novel electrode slurry uniformity testing device, which is used in the field of batteries.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] This invention sets different access temperatures at both ends of the battery electrode slurry, keeps the access temperature constant, and measures the total thermoelectric potential value. It observes whether the total thermoelectric potential value fluctuates or the range of fluctuation to determine the uniformity of the battery electrode slurry, achieving the effect of short testing cycle and low testing cost. Attached Figure Description

[0023] Figure 1 This is a simplified structural diagram of an embodiment of the present invention;

[0024] Figure 2 This is a current distribution diagram within the container body in one embodiment of the present invention;

[0025] Figure 3 This is a current distribution diagram within the container body in another embodiment of the present invention.

[0026] In the diagram, 2-temperature compensator; 3-controller; 4-thermoelectric potential measuring instrument; 5-thermocouple conductor; 6-changeover switch;

[0027] 11-Container body; 12-Container contacts. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0029] like Figure 1 The embodiment of the present invention shown provides a novel electrode slurry uniformity testing device, including a slurry container assembly, a temperature compensator 2, a controller 3, and a thermoelectric potential measuring instrument 4;

[0030] The slurry container assembly includes a container body 11 and a container contact 12. Container contacts 12 are respectively provided on both sides of the container body 11. The two ends of the controller 3 are respectively connected to a switching switch 6 through a temperature compensator 2 and a thermocouple conductor 5. The switching switch 6 is configured to connect to the corresponding container contact 12 when in use.

[0031] The thermoelectric potential tester 4 is connected to the corresponding temperature compensator 2 at both ends via thermocouple conductors 5.

[0032] In a further embodiment of this invention, multiple container contacts 12 of different heights are respectively provided on both sides of the container body 11, and a switching switch 6 can switch between different container contacts 12 located on the same side of the container body 11.

[0033] In a further embodiment of this example, the container contact 12, the switching switch 6, and the thermocouple conductor 5 are all homogeneous conductors.

[0034] In a further embodiment of this example, the controller 3 and the temperature compensator 2 are connected by a wire.

[0035] In a further embodiment of this invention, the thermoelectric potential tester 4 is equipped with a display and a signal amplifier, and the display shows the thermoelectric potential value amplified by the signal amplifier.

[0036] In a further embodiment of this example, the container contact 12 penetrates the side wall of the container body 11 and is in contact with the battery slurry placed inside the container body 11, and the container contact 12 and the container body 11 are sealed together.

[0037] It should be noted that the principle upon which this device is based is the thermocouple homogeneous conductor law, which states that when a homogeneous material is connected to a thermocouple circuit, as long as the temperature of its two connection ends remains constant, the total thermoelectric potential of the circuit will not be affected. Therefore, ensuring that the temperature of the two connection ends of the material remains constant means that the temperature of the temperature compensators 2 set at both ends of the container body 11 remains constant. However, if the total thermoelectric potential changes, i.e., the thermoelectric potential value on the thermoelectric potential tester 4 changes, it indicates that the material is non-homogeneous. The larger the thermoelectric potential value, the worse the homogeneity.

[0038] On the other hand, the present invention also provides a method for using a novel electrode slurry uniformity testing device, comprising the following steps:

[0039] The battery electrode slurry is placed inside the container body 11, and the temperature of the temperature compensator 2 located at both ends of the controller 3 is set by the controller 3.

[0040] Connect the switch 6 to the corresponding container contact 12 and observe the thermoelectric potential value on the thermoelectric potential measuring instrument 4.

[0041] In a further embodiment of this example, the switching switch 6 is connected to different container 12 contacts on one side of the corresponding container body 11, and the thermoelectric potential values ​​on the thermoelectric potential measuring instrument 4 are observed respectively.

[0042] In a further embodiment of this example, if the thermoelectric potential value on the thermoelectric potential measuring instrument 4 remains unchanged or fluctuates within the allowable error range, then the uniformity of the measured battery electrode slurry is good.

[0043] If the fluctuation of the thermoelectric potential value on the thermoelectric potential measuring instrument 4 exceeds the allowable error range, then the uniformity of the measured battery electrode slurry is poor.

[0044] On the other hand, the present invention also provides an application of a novel electrode slurry uniformity testing device, which is used in the field of batteries.

[0045] It should be noted that, based on the above-mentioned novel electrode slurry uniformity testing device, when the access temperature of one end of the temperature compensator 2 is 0℃ and the access temperature of the other end of the temperature compensator 2 is 50℃, and when the thermocouple conductor connected to the switching switch and the thermocouple conductor connected to the thermoelectric potential measuring instrument are made of platinum-rhodium 13 and platinum respectively, the thermoelectric potential value is 0.296mV, with an allowable error of 3%.

[0046] When the temperature of one end of the temperature compensator 2 is 0℃ and the temperature of the other end of the temperature compensator 2 is 50℃, and the thermocouple conductor connected to the switch and the thermocouple conductor connected to the thermoelectric potential measuring instrument are made of copper and copper-nickel alloy respectively, the thermoelectric potential value is 2.036mV, with an allowable error of 2%.

[0047] When the temperature of one end of the temperature compensator 2 is 0℃ and the temperature of the other end of the temperature compensator 2 is 50℃, and the thermocouple conductor connected to the switching switch and the thermocouple conductor connected to the thermoelectric potential measuring instrument are made of platinum-rhodium 10 and platinum respectively, the thermoelectric potential value is 0.2989mV, with an allowable error of 3%.

[0048] When the temperature of one end of the temperature compensator 2 is 0℃ and the temperature of the other end of the temperature compensator 2 is 50℃, and the thermocouple conductor connected to the switch and the thermocouple conductor connected to the thermoelectric potential measuring instrument are made of nickel-chromium and nickel-silicon respectively, the thermoelectric potential value is 2.0231mV, with an allowable error of 3%.

[0049] When the temperature of one end of the temperature compensator 2 is 0℃ and the temperature of the other end of the temperature compensator 2 is 50℃, and the thermocouple conductor connected to the switch and the thermocouple conductor connected to the thermoelectric potential measuring instrument are made of nickel-chromium and copper-nickel alloy respectively, the thermoelectric potential value is 3.048mV, with an allowable error of 3%.

[0050] When the thermocouple conductor material is determined, its output voltage and allowable error can be determined. During testing, the battery slurry only needs to be placed in the container body 11, and then the switching switch 6 is controlled to connect to the corresponding container contact 12. The thermoelectric potential value can be observed to confirm whether the performance of the battery slurry meets the standard.

[0051] like Figure 2 and Figure 3 The figures shown are current distribution diagrams inside the container body 11 when the switching switch 6 is connected to different container contacts 12. Two different contacts are tested during the test to make the results more accurate and reliable.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel electrode slurry uniformity testing device characterized by, The application relates to a novel electrode slurry uniformity testing device, which comprises a slurry container assembly, a temperature compensator, a controller and a thermoelectric potential tester. The slurry container assembly comprises a container body and container contacts, two sides of the container body are respectively provided with container contacts, two ends of the controller are respectively connected with a temperature compensator and a thermocouple conductor, and the controller is connected with a switching switch. Two ends of the thermoelectric potential tester are respectively connected with corresponding temperature compensators through thermocouple conductors.

2. The novel electrode slurry uniformity test device according to claim 1, characterized by, The two sides of the container body are respectively provided with a plurality of container contacts with different heights, and one switching switch can be switched to connect different container contacts on the same side of the container body.

3. The novel electrode slurry uniformity test device of claim 1, wherein, The container contact, the switching switch and the thermocouple conductor are all made of homogeneous conductors.

4. The novel electrode slurry uniformity test device of claim 1, wherein, The controller is connected with the temperature compensator through a wire.

5. The novel electrode slurry uniformity test device of claim 1, wherein, The thermoelectric potential tester is provided with a display and a signal amplifier, and the display displays the thermoelectric potential value amplified by the signal amplifier.

6. The novel electrode slurry uniformity test device of claim 1, wherein, The container contact penetrates through the side wall of the container body and is connected with the battery slurry in the container body, and the container contact and the container body are sealingly arranged.

7. A method of using a novel electrode slurry uniformity test device according to any one of claims 1-6, characterized in that, The application comprises the following steps: The battery electrode slurry is arranged in the container body, and the temperature of the temperature compensator arranged at two ends of the controller is set through the controller. The switching switch is connected to the corresponding container contact, and the thermoelectric potential value on the thermoelectric potential tester is observed.

8. The method of using the novel electrode paste uniformity test device of claim 7, wherein, The switching switch is connected to different container contacts on one side of the container body, and the thermoelectric potential values on the thermoelectric potential tester are respectively observed.

9. The method of using the novel electrode paste uniformity test device of claim 7, wherein, If the thermoelectric potential value on the thermoelectric potential tester is unchanged or fluctuates within the allowable error range, the measured battery electrode slurry uniformity is good. If the thermoelectric potential value on the thermoelectric potential tester fluctuates beyond the allowable error range, the measured battery electrode slurry uniformity is poor.

10. Use of a novel electrode slurry uniformity testing device, characterized in that, The application of the novel electrode slurry uniformity testing device according to any one of claims 1-6 in the field of batteries.

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